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Product Detailed Parameters
- Description：IC REG BUCK ADJ 5A 20QFN
- Series：Silent Switcher®1
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.4V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：0.97V
- Voltage - Output (Max)：42V
- Current - Output：5A
- Frequency - Switching：210kHz ~ 2MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：20-WFQFN, 18 Leads, Exposed Pad
- Supplier Device Package：20-QFN (3x4)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The LT8640JUDCF-1#WPBF is an automotive-grade synchronous buck Silent Switcher regulator from Analog Devices. It operates with an input voltage range of 3.4 V to 42 V and delivers a continuous output current of 5 A. The adjustable output voltage spans from 970 mV to 41.9 V. Key electrical parameters include a quiescent current of 2.5 µA and a programmable switching frequency between 200 kHz and 3 MHz. The device is housed in a QFN-18 package and supports junction temperatures up to 125°C, meeting AEC-Q100 standards for automotive reliability.
Feature Summary
- Integrates Silent Switcher technology to minimize electromagnetic interference radiation without external filters.
- Features ultra-low quiescent current for efficient power management in standby modes.
- Includes integrated synchronous rectification for high conversion efficiency across load ranges.
- Certified to AEC-Q100 standards for robust performance in automotive environments.
Applications
- Automotive infotainment systems requiring low noise power supplies
- ADAS sensor modules needing stable 42V-to-low-voltage regulation
- Telematics control units operating in harsh thermal conditions
- Body electronics distribution networks
Procurement Notes
Verify the specific suffix '-1' against the official Analog Devices datasheet to confirm pinout or functional variations compared to standard LT8640 variants. Ensure the QFN-18 package orientation matches your PCB footprint design. Confirm that the AEC-Q100 qualification aligns with your specific automotive grade requirements before finalizing procurement.
Selection Notes
Select this component when designing for 42V automotive architectures requiring compact footprints and strict EMI limits. The wide input voltage range accommodates cold crank and load dump events. Consider the 2.5 µA quiescent current for battery preservation applications. Ensure thermal management strategies account for the QFN-18 package's exposed pad requirements under full 5 A loads.
Part Context
This part belongs to the LT8640 family of Silent Switcher regulators designed for demanding industrial and automotive applications. The series emphasizes compact size and low EMI through integrated shielded inductor technology. The LT8640JUDCF-1 variant specifically targets automotive markets with enhanced reliability certifications and optimized performance characteristics for vehicle power distribution networks.
Replacement Considerations
LT8640JUDCF#WPBF: Standard automotive version without the -1 suffix variation; verify pin compatibility. LT8640SEV#PBF: Higher current 6A variant in LQFN-24 package; requires layout adjustment. LT8640IUDC#TRPBF: Industrial grade version with different temperature rating; check environmental suitability.
